Looking for CAT guru ynot

That last sentence was supposed to end with “!” Not “?” should of proof read better.

 

Hello everyone!
This is my first time joining, let alone posting on a forum so please bear with me.

I bought my first truck and need a place to ask questions and learn.

It is a 1994 379 with with what I was told is a B model Cat. I had exhaust leaks do I pulled it apart last night to find round ports on the block and a square manifold...

Engine # 3ZJ41978
Pump # 7E5888

Any info on this combination?

where do I need to look in order to find the head serial number?

Thank you!

 

Looks like it's a C model

 

Reman cylinder heads exhaust ports could be round or square port.

 

Here is some info from CAT SIS

Engine Serial Number - 3ZJ41978 (Build Date - 08/06/1993, Test Date - 09/06/1993, Ship Date - 06/08/1993)

317 BRAKE KW (425 BHP) AT 2000 RPM. PETERBILT, JAKE BRAKE

 

How bout a 3zj51437? I’m being told this engine takes either a 0r4337 or 0r8243 nozzle and nobody can tell me why?